This is a proper doc, polished too the nines. The problem with its polish is it glamourizes and dramatized the period to a Hollywood standard. I am not sure how historically accurate the scenes are. Looks like Last Samurai.
But it all sells the story and you def need to stay on top of it because the names will throw you. I would love to now go and read a book about the subject for further details. I am no expert so I have to take the information as factual and thank the producers for one polished historical production. Very similar to the one on Rome which was epic!
Review of Age of Samurai: Battle for Japan
